Muffler.



PATENTED MAY 26, 1908. G. J. GUSTAFSON. MUFFLER.

APPLICATION FILED NOV. 1. 190s.

M on i bwe/aow UNITED STATlIS PATENT OFFICE.

CHARLES J. GUSTAFSON, OF'ItEADING, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO READING STANDARD COMPANY, A CORPORATION OF PENNSYLVANIA.

MUFFLER.

Specification of Letters Patent.

Patented May 26, 1908.

T all-whom it may concern:

Be it known that 1, CHARLES J. GUSTAF- SON, a sub'ect of the King of Sweden, and a resident of the city of Reading, county of Berks, and State of Pennsylvania, have invented certain new and useful Improvements in Mufllers, of which the following is a specification.

My invention relates particularly to mufflers for internal combustion en ines and my main objects are to thoroughly e iminate the objectionable noise ordinarily produced by the exhausting gases of combustion while securing proper freedom of the exhaust; and at the same time to provide a device of sim 1e and substantial construction.

' e invention is fully described in connection with the accompanyin drawing and the novel features are specifica y pointed out .in the claims.

Figure 1 is a longitudinal sectional view of a simple form of muffler embodying the features of my invention. Fig. 2 is an end View of the same.

In my improved muffler, as shown, the exhaust is dischar ed throu h a central tube a, extending the full lengt of the muffler and open throughout its lenght; there being grouped around the main ortion of this tube a series of concentric cy inders b, c and d,- united by cylinder heads h and m r near the opposite ends of the tube and forming a corresponding series of annular chambers e, f and g; the outer one of which chambers communicates directly with an annular ex haust-inlet chamber a formed in the head m 1 around one extremity of the tube, and indirectly with the latter, so that the exhaust gases are assed through each of the concentric cham ers and finally discharged through the central open tube, as hereafter described.

In the preferred construction indicated, the concentric cylinders 11, c and d surrounding the central tube a, are carried by opposite heads h and m suitably fixed to the latter. Saidhead h forms a closure at one I end for all of the annular chambers e, f and g,

while the opposite head m, as shown, is

smaller cylinders b and care properly spaced and su ported; the exhaust inlet chamber n being eft in free communication with the outer annular chamber 9 around the main portion of the tube a.

The passage of the exhaust gases through the successively reduced chambers g, f and e, into the central discharge tube a, 18. circuitous, as indicated by the arrows; the communicating openings 8, t and a being located alternately near op osite ends. Thus thb gases entering the iarger outer chamber gthrough the inlet chamber n are at once freely expanded, thereby greatly reducing their velocity and temperature; after which their further movement to the final point of discharge through the central tube ais restricted as indicated so as to apparently cushion the successive exhaust blasts within the mufiier and thereby effectively eliminate the noise without involving back ressure in the cylinder. satisfactorily attained in practice; thus providing a very effective muffler as to operation, while at the same time the construction is most simple and strong. The central discharge tube a may be left 0 en at both ends, or be closed at one end, an the specific construction shown otherwise modified.

What I claim is 1. A muffler comprising a central dis charge tube, concentric cylinders forming communicating annular chambers around the main portion of said tube, a closed 0 lin-- der head upon one end of said central tu e, a cylinder head upon the opposite end of said tube and being formed with an annular exhaust inlet chamber open on one side only and communicating with the outer annular chamber, and a'ring arranged u on said tube adjacent the second cylinder head for closing the ends of the inner chambers.

2. A muffler com rising a-central tube, an inlet cylinder'head on one end and being formed with an annular groove 0 en on the This desired resu t is very inner side of the inlet head and orming an exhaust inlet hhamber,'concentric cylinders arranged u on said tube and closing the inner circu erential portion of the opening in the side of the inlet cylinder head and also closing the adjacent ends of the inner or Central cylinders, said annular exhaust inlet chamber eonnnunieating through the outer 1 oiroumfefentiol portion. of the said opening 5' with the outer 2 11111113,? chamber. i

3. In omuffler, a centre discharge Lube, concentric oylinders forming eounuuniezzting 1 11111111151? chambers around the main portion of the tube, cylinder heads embracing the l ends of the outer eylizuler, :1 ring upon the tube, said-ringond one 01 said yylinder ufiezuis 1 embracing the ends of the remaining eyiinlers one of said heads; I

being formed with an Inlet openmg and an annular exhaust inner chumne" open on the innef side only of the o 11 open sule bvmg pzu'tlully covered by said ring and the outer annular chamber being 111 eoumuuneutlon wlth the annular exmlet {:hlll'lbfil' through the remmnlng must um-overed. portion of said estuuony whereof, I:

In i

open side. :Lifix my signature, 2

in the presence of two witnesses.

W itnesses:

STEWART, Ewen. 

